Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['m', 'y', 'Y', 'O', '6759', 'r', 'v']

13, 25, 25, 15, 6759, 18, 22